Routing tool



J. N. BAKER.

ROUTING TOOL.

CATION FILED J'ULY 31,1918.

Patented July 25, 1922.

INVENTQR.

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.UIUIINIINIIUIIIII Mba UNITED STATES PATENT OFFICE. I

l'AMES N. BAKER, OF BROOKLYN, NEW YORK, ASSIGNOR TO R. HOE AND C0., OFNEW YORK, N. Y., A CORPORATION OF NEW YORK.

noUTrNG roof..

Specification of Letters Patent.

Patented July 25, 1922.

Application filed July 31, 1918. Serial No. 247,471.

To all whom t may concern:

Be it known that l, JAMES N. BAKER, a citizen of the United States,residing at 363 Lenox Rd., Brooklyn, county of Kings, and State of NewYork, have invented certain ne-w and useful Improvements in RoutingTools, fully described and represented in the following specificationand the accompanying drawings, forming a part of the same.

This invention relates to certain improvements in routing tools employedfor routing or finishing electrotype, stereotype and other printingplates, and the invention relates particularly to an improved holder forthe cutting tools by which the routing is effected.

It is the especial object of the invention to provide a tool of simpleconstruction and design which may be driven by a high speed motoractuate-d by either alternating or direct current, and in whichprovision is made for controlling the motor speed to prevent the motorfrom running away when there is no load on the tool, and in whichprovision is also made for cooling the motor, and for providing anddirecting an air blast or air current at the tool point so that the workis kept clear of chips, this being especially desirable in routing toolswhere the tool is constantly moved from place to place on the worksurface.

A further object of the invention is to provide a construction foreffecting this purpose, which is self contained. that is, in which allthe operative parts are assembled to produce a unitary structure, whichcan be readily moved from place to place on the work, as required.

With these and other objects not specically referred to in view, theinvention will now be fully described in connection with theaccompanying drawings, in which Figure 1 is ahvertical section of theimproved routing tool holder.

Figure 2 is a plan view partly insection showing the fan, the view beingtaken on line 2-2 of Figure l1. y

Figure 3 isa side view partly broken away of the cover or casing for theholder illustrating a method of supplying air to the holder; and

Figure 4 is a diagrammatic view on a reduced scale showing one method ofmounting the holder with relation to the work.

Referring now to the drawings, the routing tool 1, which may be of anysuitable character, is shown as clamped to a vertical tool shaft 2 by arotary clamping device 3, of any usual or suitable character to enablethe tool to be readily placed on or removed from the holder.

Devices embodying the invention in its preferred form, will include aholder in which the operating parts of the device are carried so as toproduce a compact unitary structure, and this holder will, furthermore,be designed so that a current of air may be directed through the holderfor cooling the driving means, and so that a current of air will bedirected to the tool point so as to keep the work clear of chips. Whilethe specific construction of this holder may vary somewhat, in theparticular construction illustrated, there is provided a casing 4,preferably circular, which at its lower end has secured thereto a bottom5, formed with a projection 6, in which is formed a bearing for one endof the driving shaft 2, before referred to. This driving shaft 2 extendsthrough the casing and takes its bearing at the other end in a bearingblock 7, carried in a top plate 8, secured to the casing 4 in anysuitable manner as by screws 9 taking into a flange 10 formed on theupper end of the casing. The driving shaft 2 isdriven by a high speedmotor operated either by a direct or alternating current. The armatureof this motor is secured to the drivingshaft, and is indicated generallyby the numeral 11, the field beingr indicated by the numeral 12. The topof the casing is enclosed by a perforated cap plate- `13, this cap platefitted over the plate 8, before referred to, a space 14 being leftbetween the cap plate 13 and the plate 8 for effecting ingress of air,as hereinafter referred to.

In accordance with the invention, means are provided for effecting thecooling of the motor, and for directing a current of air to the point ofthe tool. In this class of machines, it is desirable also thatcontrolling devices be provided for preventing the motor from runningawa-y when the tool is removed from the work, and the ,motor loadceases. In machines embodying the invention in its best form.',' a'common. means will be employed for effecting the cooling and controllingof the motor and for directing an air current to the tool point. Vhilethe specific means may be varied, as illustrated there is provided a.fan 15, which is secured to the driving shaft 2 and operating in acompartment formed between the bottom wall 5 of the casing and a plate16, provided with a central aperture 17, through which the fan may drawair. This fan may be of any usual or suitable type, but in the particular construction illustrated, it comprises upper and lowersupporting flanges 18, 19, between which are formed wings 20. Therotation of this fan acts to draw a current of air through theperforated cap 13 and space 14, before referred to, down through thecasing around the motor armature, thus keep ing the armature cool andthe resistance offered by the fan, furthermore, acts to control thespeed of the motor and keeps it from running away when the tool isremoved from the work, and there is no load on the motor.

The fan 15, also, acts to produce a current of, air, this air currentbein directed adjacent the working point of t e tool so that it keepsthe work free of chips about the tool point. While this may be effectedin various ways, in the preferred construction, the casing 4 is providedwith a port 21 which leads to a nozzle 22 secured to the Wall of thecasing, the delivery end of this nozzle `being extended downwardly andinwardly so that the air current is delivered closely adjacent to theworking end of the tool and obliquely to the tool, whereby the chips areeffectively blown away froml the tool point, and the operator is enabledto clearly see the work.

The toolmay be handled by the operator in any desirable fashion,depending on the work employed. If desired, however, the tool may bemounted on the Work support so that it can be readily removed toany partof the work desired. One such method of mounting the tool is illustratedin Figure 4 of the drawings, in which there is provided an arm 23pivoted at 24 to the work support 25. This arm 23 has pivotally securedthereto at 26 a tool carrying arm 27, to which the tool is clamped at28, in any suitable manner, the tool beingguided to the work byoperating handle 29.

.While the invention has been illustrated in what is considered its mostpractical form, it will be understood that within the scope of theclaims various changes may be made in the specific construction andarrangement of the parts without departing from the ing ventlon. r

What I claim is.

1. In a routing tool, the combination with a tool carrier, means fordriving the carrier, a. fan driven by the carrier, driving means forproducing a currentof air, and enclosed connections leading from the fanto the Working end of the tool whereby an air current is directed to thetool point and the point kept free from chips.

2. In a. routing tool, the combination of a casing, a motor mountedtherein, a tool shaft taking bearings in the casing and driven from themotor, a perforated top for the casing, a fan located in the casing atthe bottom thereof for producing an air current through the casing, anda nozzle leading from the fan to the tool point for directing theproduced air current t0 the point of the tool.

3. In a routing tool, the combination of a casing, a motor mountedtherein, a shaft driven from the motor taking bearings in the casing, afan in the casing driven from the shaft, a nozzle leading from the fanto the tool point, and means for pivotally supporting the casing.

In testimony whereof, I have hereunto set m hand.

y JAMES N. BAKER.

